The 1,000-Worlds Method
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
To compute with degrees of belief, imagine 1,000 parallel cases distributed exactly as you believe, and count.
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Believe 0.3 in rain tomorrow: then in 300 of your 1,000 imagined tomorrows it rains, and any question becomes counting.
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The translation runs both ways — beliefs to counts before computing, counts back to a fraction after.